<?php
/*
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*/
 header('Content-Type:text/html;charset=utf-8');
 //第一步；连接数据库db_yt
 $db= new mysqli('localhost','root','','db_yt',3306);
 //检测是否连接成功
 if($db->connect_errno){
     die("连接失败，出错信息是".$db->connect_error);
 }
 $db->query("set name utf8");